Method for effectively breaking up latex-coated paper during pul

Details Method for effectively breaking up latex-coated paper during pul Method for effectively breaking up latex-coated paper during pul

1990-06-20

1991-03-05

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162191, 162199, 162DIG4, D21C 908, D21H 2102

Patent

active

049975234

ABSTRACT:
A composition and method for inhibiting the deposition of white pitch on the surfaces of papermaking equipment during the processing of recycled coated broke. The process involves adding to the coated broke during repulping a composition having a first compound of a tetrafunctional alkoxylated diamine having the structure: ##STR1## wherein R.sub.1 and R.sub.2 are ethylene oxide or propylene oxide and R.sub.1 and R.sub.2 are not the same, and a second compound selected from the group consisting of a phosphate, phosphonate and phosphonic acid.

REFERENCES:
patent: 3748220 (1973-07-01), Gard
patent: 3808089 (1974-04-01), Von Koeppen et al.
patent: 4056430 (1977-11-01), Hoeger et al.
patent: 4643800 (1987-02-01), Maloney et al.
patent: 4735682 (1988-04-01), Didwania et al.
patent: 4861429 (1989-08-01), Barnett

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